This construction site has been mapped a number of times with the Hovermap UAV lidar payload. The successive scans are automatically aligned allowing accurate monitoring of changes over time. The entire 100 x 70m site is mapped in a single 10min flight by flying 4 GPS transects approximately 12m apart. For the first three scans the flight altitude was 10m above the terrain and for the 4th scan the altitude was adjusted to remain at least 4m clear of the building roof. The flights were conducted by V-TOL Aerospace and access to the construction site was provided by Scott Harris Constructions.